Pneumatic relooping machine



Jan. 9, 1940. B. ||4 GosTKowsKl PNEUMATIC RELOOPING MACHINE Filed Aug. 51, 1937 5 Sheets-Sheet 1 IN VENTORf BEDRI H U55EIN GosTKowKl M95?- ATTORNEYS Jan. 9, 1940. B. H. GosTKowsKl PNEUMATIC RELOOPING MACHINE Filed Ag. 3l, 1957 5 Sheets-Sheet 2 IN VEN TOR: BEDR: Huja/N GoTKowS lmwgg ATTORNECS `Ian. 9, 1940.

B. H. GOSTKOWSKI PNEUMATIC RELOOPING MACHINE Filed Aug. 5l, 1937 3 Sheets-Sheet 3 IIIII INVENTOR= v BEDR/ HUSE/N GOSTKOWSK/ BY ,@Z/Q

ATTORNEMS Patented Jan. 9, 1940 y t t y A865031 UNITED STAT-Es* .PATE-NT oFFlcE Application' Augustr31, 1937, Serial No. 161,785 In Germany September 2, [1936 e This invention relates to a pneumatic reloop intended to work the relooping needlejother deing machine. r e tails and improvements rwill be dealt ywith more` `Differentxmachines of this: kind are already in detail iIll the fOllOWing description-v known. They all consist of a pump worked .by Figs. l to show a iirst embodiment of thein- 5 an electric motor, the air'pumped by said pump vention given by way of example.. Y

acting on a piston to which is xed the reloop- Fig. illustrates a modicatio-n or second erning needle which, consequently,l effects a to and f bodiment of the invention.` f fro movement the rhythm of which is determined Figs. 7, 8- and 9 are fragmentary views of deby the rhythm of the airrpump. r tails, Figs. 7 and 9 being also partly in section, 10' It is also known, on the other hand, that in and all threeiigures being inverted with respect l0 .relooping operations, itis preferable that the t0 Fig. 6.v I

needle in its rest position should occupy its rear- Fig- 10 is a detail 0f iegUlaGiOn means 0f the most position, i. e. its rear dead centre, so that apparatus of Fig. 6, while n on beginningl the work, the first movement it Fig-11isa`m0difl0ati0n Of-Slleh means.

I executes shall always be a forward movement Fig'- 12 illustrates a needle holder for the in- 15' from the rear in the 'direction of the fabric to be` VenliOII, ShGWIl Partly 'in 'SeCliOIll repaired. i f f Throughout the views the same reference nul In theexistingpneumatic machines, said result meials indieate like Parts is obtained. by providing theneedle holder with FigliS a'v Plan' VieW 0f the Whole maChine an internal Ispring intended toy `push back the andFig- 2 aidetail Of `the main pump 0f Same; 2U needle toitsfrear dead centre whenever the pump Figs. 3 and4 showiin two different DOSitiOIls an is out of action, ,the working then consistingr in air slide valve Working electro-magnetically; Fig. compressing airagainst the action 0f Said spring, 5 is a diagram-of the electric connections of the so .that Only one of the two movements of the v WhOle machine# needle is effectedpneumatically; the other being 'In the planfvieW 0f Fie` l, the electric motel 25 effected mechanically by the action of a return Werking the machine is .designated-by l and 00mspring. l prises a smallfpump 2 vintegral with same and the The drawback of en machines constructed on purpose of which istoproduoo the vacuum necthis .principle is the irregular movement of the eSSaIY fOI' keeping the Iel00PiI1g needle in its rest needle, for said needle is subjected in one direc' position et the realv deed Centre- By means of :to:l tion to an .-eiort resulting from a cause differthe belt 3,'the`m0'01l LllVO-'llSsYOIle Of the parts 4 ent to that 'working it in the other direction. It of aclutch 4, 5, the seoondpert 5 of which isv is besides impossible to regulatethe value of the connected with a disk 6 bearing the crank to effort furnished by the needle, for. even if the" which is fastened the piston rod 1 of the main quantityvv of pumped air were diminished, and pumpf- At 9-isf100ated an eleetIO-magnet in- 35, this would correspond toa shorter stroke or to l tended to Work the clutch 4, 5 by means of .e a smaller eiort of the needle in oneof its WorkleVel' l0 and 0f a felk 100th, mOVed by the ing directions, said needle howeverwould stili movements of the Core l2 of seid electro-magnet. be subjected to e.A variatiel effort, that of the The position shown corresponds to the eleotro- 40 spring, vin its other Working direction, magnet when disenergizedand to the clutch when 40 The Vobject ci the machine according to the inunolutohed; While noting on the clutch, the oor-e Vention is to d0 away with the aforesaid dfawl2 acts OIl the ail distribution inside a SleeVe I3 backs, said machine permitting of utilizing a Comprising fOr this pul'IJOse` different ducts to needle holder withontreturnspring, whiie having which reference will bemade hereinunder. The

a rest position of the needle at the rear dead Spring I4 Serves t0 bring backthe core I2 to the 45.`

centrel and further the possibility of regulating position ldrawn whenever the electro-magnet the effort thatv the needle isl capable of furnishe ceases to be energized.

ing while working. i The impulses produced by the movement of the For this purpose, the machine according to the pislJOn 0f the Dump 8 are sent through the pipes invention comprises chiey means permitting or I5 andthe ducts of the sleeve I3 to the exible 50;

exerting a sucking action on the piston working tube 1 6 connected 'with a needle holder of the the relooping needle, 'whenever the needle ceases type to be describedhe'reunder. y

to work.A This action generally comes from an 2 shows in detail a device proper to the auxiliary pump specially intended for said purdisk 6 and permitting of varying the amplitude pose, but can likewisegcome fromthe mainpump ofthe movement given to the piston I1 of the 55 main pump 8. Said device consists of a pivot I3 integral with the disk 6 and of a cranked lever I3 capable of rotating about said pivot. To one of the arms of said lever, at 20 is xed the piston rod 'I. The position shown in dot and dash line shows how the displacement of th-e lever I9 permits of displacing the pivotal point 20 by drawing it away from or drawing it near to the centre of the disk 3, and this permits of increasing or of diminishing the amplitude of the movements transmitted to the piston I'I.

Said piston is nally subjected to the action of a spring 2i intended to bring same back toits rear dead centre whenever the clutch 4, 5 is unclutched. The auxiliary suction pump 2 is likewise connected with the sleeve I3 by means of the pipe 22. Figs. 3 and 4 show how said pipe 22 and the pipe I5 issuing from the main pump 8 can be connected, either with the outside air, or with the outlet 23 leading to the needle holder.

Fig. 3 shows the electro-magnet 9 disenergized. In this case the outlet 23 is connected through the duct 24 and the pipe 22 with the auxiliary suction pump 2, while the pipe I5 connects the mainpump b-y means of the groove 25 with the outside air.

` Fig. 4 shows the same members, when the electro-magnet 9 is energized, in this case the internal duct 24,'connects the outlet 23 with the main pump 8 through the pipe I5, while the auxiliary suction pump is connected through the groove 2B and pipe 22 with the outside air.

The electric diagram of Fig. 5 will easily permit of realising how the machine just described works. The terminals 21 permit of connecting said machine with the electric network, by means of a switch 28 to be seen in Fig. 1. The machine is further completed by a foot controlled switch shown diagrammatically in the right hand portion of Fig. 5. Said switch comprises a regulable resistance 29 and a contact piece 30 and can be connected with the machine described by means of the three terminals 3l. The resistance 29 and the contact 30 are placed opposite each other and by means of the foot, a slidable contact so constructed as to be always connected with the resistance 29 can be made to slide between said resistance and said contact 30, whereas said movable contact moves away from the contact 39, when the whole resistance is inserted, a positioncorresponding to what is shown in Fig. 5 and to the rest position of the relooping machine.

It will be' seen that in this position of the contact of the pedal, the motor I runs slowly for the whole resistance 29 is inserted and the electro-magnet 9 does not receive any current. The auxiliary suction pump 2 is thus working, the clutch 4,5 is unclutched and the position of the core I2 corresponding to Fig. 3 causes the sucking action ofr the pump 2 to be transmitted to the needle holder.

As soon as the pedal is worked and the slidable contact moved, said contact moves along the resistance 29 the value of which diminishes and immediately reaches the contact 30, and this causes the energization of 'the electro-magnet 9. rIhe core I2 is drawn at the same time as the clutch 4, 5 is clutched and sets the main pump 8 into action. As the displacement of the core I2 effects the communication between the needle holder and the mainv pump 8, it will be seen that the latter immediately starts the needle working. It will likewise be seen that the rst movement effected by the piston I1 of the pump 8 is a compression movement against the action of the spring 2I, and this is necessary as the piston of the needleholder is in its rear dead centre position and it must in the first .place be pushed forward.

By Varying the position of the lever I9, a more or less hard action will be obtain-ed on the piston of the needle holder.

In the second embodiment of the machine according to Figs. 6to 9, the driving mechanism is simplified in that the clutch is abolished. It will be seen hereinunder by what means this has been made possible.

In the plan view according to Figf, the electric motor I is found again driving, by means of the belt 3, a shafty bearing a disk 6, to which is fastened the piston rod 'I of the main pump 8. The machine likewise comprises an electromagnet 9, the core I2 of which is in this case used only to modify the distribution of air in the sleeve I3, a spring I4 being likewise provided to keep the core I2 in the rest position shown. The auxiliary-suction pump 2 is worked from the shaft bearing the Adisk 6 and by means of an excentric 32. Said pump is of the oscillating cylinder type, the axis of oscillation being constituted by the screw 33.

In the working position, the pulsations communicated to the air by the pump 8 are transmitted through the pipe I5 and through the slide.

valve to be found at I3 to the iiexible tube I6, at the free end of which is situated the needle holder 34. 'I'he auxiliary suction pump 2 is likewiseconnected with the sleeve I3 by the pipe 22. Finally the electric diagram is similar to that of the first embodiment and comprises in addition to the foot controlled contact not shown in the drawings the terminals 21, the switch 28 and the terminals 3|. At 35 is located a cylindrical sleeve in which the needle holder 34 is placed, when the machine is no longer being used.

The air distribution in the sleeve I3 is similar to what has been previously explained with regard to Figs. 3 and 4, i. e. in the rest position shown, the needle holder is connected by the pipe 22 with the auxiliary suction pump 2, while in the workingposition when the electro-magnet 9 is energized, the needle holder 34 is connected by the pipe I5 with the cylinder of the main pump 8.

The piston oi` the needle holder 34, the rod 35 of which bearing the needle 31 can be seen in the plan view, is thus constantly kept in its real-most position by the effect of the suction produced by the auxiliary suction pump 2. But as soon as the machine starts working, said piston executes a to and fro movement pneumatically communicated from the main pump 8. It is to be remarked that said pump is always working, as there is no clutching member permitting of clutching and unclutching it.

In these conditions, said pump comprises a special device permitting it of being worked correctlyvand without'which the machine could not be used'in the case for example in Iwhich the electro-magnet 9 were lto be energized at the moment when the piston of the pump 8 effects its suction stroke. In this case, indeed, a vacuum would be produced in the cylinder of the needle holder 34, in the tube I6, in the pipe I5 and in the cylinder of the pump 8 and at the next compression stroke of the piston of said pump, the space just mentioned would not contain enough air for a positive impulse of the piston of the needle holder.

The-construction of the device permitting the pump 8 of effecting the position occupied by its piston at the moment when the electro-magnet 9 is `energize'dLis as follows. -Said device isl shown in Figs. '7v to 9 'inanother disk 4 I`, substantially the same'in size and capable of coinciding with'the rst disk whenever the piston rod'i lies in the axisoi the pump, i. e. Whenever the piston 38 occupies dead centres either rea;^ or forel In said position when said two diskshcoincide, bores 42, 4t bored in their centres coincide withk each otherythus giving passage to the air ledin a ile'xible'tube 44 33 into the cylinderr ofthe pump 8 or onthev contrarylfrom said cylinder inorder to produce the sucking action required to keep the relooping needle Sat-itsrear dead .centre whenfsaid needle iswat rest.

through the piston through the piston `to the outside. o

As shown in the position in Fig. 8, Ithe bores 42, 43' cease'coincidng as soon as the rod 'l moves away vfrom the axis of the pump and oscillates laterally.

The disk 4l indeed only eins in the amai to and 'fro 4movement of the piston 38, but not in the lateral oscillating movement, as it-is se-` cured t'o the piston 38 by means Aof twofelastic blades 45 intendedl tojapplythedisk'dl iirrnly against the disk 40. l

In the case already mentioned in which the electro-magnet were to 'be energized when the ypiston 38 yeffects its sucking stroke, it will be seen that at the end of the. stroke, at ythe momentv when the rear dead 'centre is vbeing passedover, when the bores'dZ, i3 '.coincide, the cylinder of the pump 8, the 'pipe"i5, andthe tube i5 can be instantly filled with air thus permitting the piston 38 of transmitting its impulse to the piston of the needle holder'tll.v v y y There is no needy todeal 'with the `starting position of the piston 38 wheny the work is begun.

Similarly, any eventual losses or leakages in the pipes transmitting the air pulsations arev without importance for vat the end of each compression stroke the cylinder of the pump 8- is en-l `tirely emptied and at thefend of each sucking stroke it is possible for same to be lledcompletely. n

This very important fact permits' of providing the machine according to the invention with means regulating theeiort transmitted to the needle. consisting simply inv an vair escapethat' y can be regulated, and which is introduced in the circuit travelled over by said air. l

Fig. l0 shows such regulating means.' Said figure shows the main pump with its piston 38` andthe pipe l5 issuing from said pump.l On said pipe is inserted a cock iii closed by a conical obturator and permitting the air of escaping Thev amount ofA outside through an outlet M.

. air vescaping can be regulated by turning the lever 48. kIt is obvious ,that if the amount of air escaping is very great, the greater Vpart ofy the work furnished by the pump 8 willbe lost and only a small part will be transmittedto the needle holder, while if the escape isvsul'ipressed,l

all the work of the pump will be transmitted. It is thus possible in this way to regulate `continually, while the machine is running, the action of the relooping needle which,l according to the i ars-agace its' work, whatever maybe l;

force 'of the'impulses received, will furnish-more eiort with'a greateramplitudeor less eiort with a smaller amplitude.

Fig. 1l shows; another way of obtaining a regulation like the' one just described. Accordingv to this example, a cushion of air 9 volumeis introduced inthe pipe l5. The modicationiin-volume vis obtained by means of a piston EIL-"which can be movedby means of a lever 5l 'anda cam 52 against the action of a spring 53. `yIt isobvious thatif said cushion or airis 'relatively Igreat in volume, it will absorb part of they'work-furnished by the pump 8, while if'itsvo1ume'- is small or even if it 'couldbe reduced to'zer'o, all the work of the` pump 8 would be transmitted entirely to the needle holder.

of variable Said cushionl of air 49 thus acts like an elastic i member of variable tensionintr'oduced between tl'epropulsivemembers and the members worked bythe machine.

` The machine just-described could lbe 'further simplified in ythat Vthe'auxiliary suction pump 2 could besuppressed by using the main pump 8 Fig'.vl 12 shows finally'dhow the needle holder referred to` in the description j oi the diierent i' yemlooodir'nen'tsl given by" way vof"'example works.

Said 'needlefholder'.consistsoija `cylinder 34,' in o which a piston` y58 bearing the rod 36 and the needle 31 can'move.y Normally, Ait would be sunlcientto dispose at either end of the stroke of the piston 58 a very small lspring just sufcient f yin Fig. l1, the value of the force transmitted to vthe'p-iston 58 is modified. Now, if said force is very small, the piston oscillates in the free space between' the two springs'59 and '69; without, so to say, compressing said springs.` 'Ihe amplitude :of the movements of the needleil ,isthus relatively small, but in proportion as the force transmitted to the piston 58 increases, the latter cornpresses the springs 58 and 60 more and more andA the amplitudeof the movement obtained increases. Thus, .itr is possible to act on the amplitude of the movements of the relooping needle to a fairly llarge extent, and this would not be possible with small ordinary deadening springs. It is obvious that the means described to obtain the results sought after and inparticular f to -make it possible for the imain'pump 8 to be filled and toy be emptied completely at each suction or compression stroke, may differ from what has been described without departing'from the scope of the invention. f

What I claim is:

LA pneumatic relooping machine comprising 70 a cylinder member servingasna needle holder containing a reciprocable piston'to which a relooping needle is attached, a motor driven `air pump hav- `ing a pump cylinder containing a pump piston andv being connected to said cylinder member so that the air yfrom the pumpwill act upon said piston and cause the same and said needle to reciprocate in rrhythm with said pump, `driven suction means, and means bringing said cylinder member into active communication with said suction means when the piston is at rest in order to retain said piston in retracted rest position.

2. A pneumatic relooping machine comprising a cylinder member serving as a needle holder containing a reciprocable piston to which a relooping needle is attached, a motor driven air pump having a pump cylinder containing a pump piston and being connected to said cylinder` member sov that the air from the pump will act upon said piston and cause the same and said Aneedle to reciprocate in rhythm with said pump,` a motor driven auxiliary pump comprising an elastic member capable ci producing a suction effect in order to return the needle to rear dead center when the pump is at rest, a connection between the air pump and cylinder member and an air Y siide valve controlling said connection, a clutch between the motor and the `air pump, and an electromagnet capable of operating `said slide valve and said clutch so that when said motor stopped the electromagnet unclutches the motor from said air pump and establishes a oon-` nection between said cylinder member and said auxiliary pump, and when the motor is running said electromagnet clutches inthe motor with the air pump and causes the slide'valve to pass air through said first connection to said cylinder member so as to operate the needle.'v

3. A machine according to claim 2, wherein the electromagnet is provided with a movable core formed with an air duct moving with said core, said air duct being capable of connecting the air pump with the cylinder member in one position of said core when said electromagnet is energized and of connecting said cylinder member with the auxiliary pump in another position of said core in cie-energized condition of said electromagnet.

4. A machine according to claim 2, wherein the main air pump is provided with means capable of opening communication between the interior of the pump cylinder and the atmosphere upon approach of the pump piston to either end of its stroke. l 1 i 5. A machine according to claim 2, wherein the pump piston of the main air pump has a piston rod provided with a disk which partakes of all the movements of said piston rod and a second'disk is applied against the rst disk and partakes of the movements of the pump piston, and wherein both disks have central bores which coincide upon approach of said piston to either end of its stroke, and the central bore of the rst disk com municates with the interior of the pump cylinder.

6. A machine according to claim-.2, wherein the motor is connected to an invariable current supply anda resistance means `is included in the connections from said current supply to the motor, allowing Asaid motor` to operate at a sufficient speed to maintain the auxiliary pump operating effectively to retain the relooping needle and the piston to which it is attached in retracted rest position, and wherein a contact in said connections is movable along said resistance means and capable upon reduction of the acting resistance by movement along the resistance means to close the circuit of the electromagnet and cause ythe sameV to operate and elect communication between the cylinder member and the main air pump.

7. A machine according to claim l, wherein the connection between theair pump and the cylinder member of the relooping needle comprises a connecting member having adjustable outlet means capable of bringing said connecting member into communication with the atmospheric to a degree which is variable at will,

8,. A machine according to claim l, wherein 'the cylinder member is interiorly provided with a spring at each end occupying'about one third of the length of the interior, the piston to which the relooping needle is attached moving between the two springs and both springs being substantially equal in resistance.

BEDRI HUssEIN GosTKoWsKl. 

